Brazing alloys



' No Drawing.

Patented l fter.

BQBER'E. T. GILLETTE, 0F SCHENECTADY, NEW YGRK, ASSIGNOR T0 GENERAL TRIO COMPANY, A CORPORATION OF NEW YORK.

PATENT OFFICE.

ELEC- BRAZING ALLOYS.

The present invention relates to brazing alloys. It is one of the objects of the invention to provide an alloy which may be produced at reasonably low cost and employed generally wherever ordinary commercial silver solder alloys may be employed on metals that melt at about lOOO C or higher.

Ordinary silver solder which contains approximately 50 percent silver, 33 percent copper and 17 percent zinc has certain disadvantages. -For example, the zinc content has a tendency to vaporize at a temperature as low as 420 C. and thereby raise the melting point of the alloy, and the large amount of silver present makes the use of the alloy very expensive. 1 V

I According to the present invention, 1 make itbrazing alloy consisting of approximately 8 2 percent copper, 8 percent tin and 8 percent silver. Such an alloy has a melting Application filed June 22,

present alloy will firmly unite copper and castmm in a hydrogen atmosphere even when the cast iron has not been subjected to raised, while if the tin content is increased slightly, say to 10 percent, the alloy is rendered too brittle. The copper content may be lowered if the silver content is'increased. Such a variation, however. obviously is undesirable, since the cost of the resulting alloy will be unnecessarily increased and no advantage obtained by the Increased amount of the silver.

JJhet l claim as new and desire to secure by Letters Patent of the United States, is:

1. A brazing alloy consisting mainly of copper but containing about 8% tinund an appreciable amount of silver, said alloy having a melting pointsin the neighborhood of 2. A- brezing elloy containing approximately 84-. percent copper, 8 percent tin and 8 percent silver. y

. In witness whereofll have hereby set my hand this 21st da of June, 1927.

R BERT T. GILLETTE.

Gil 

